Electric insulator.



UNITED STATES Patented. May 19, 1903.V

PATENT OEEICE.

EDWARD J. BURKE, OE OLYPHANT, PENNSYLVANIA, ASSIGNOR, BY DIRECT ANDMESNE ASSIGNMENTS, OE ONE-HALE TO JOHN F. CUMMINGS AND PETER YV.ANDERSON, OE OLYPHANT, PENNSYLVANIA.

ELECTRIC INSULATOR.

SPECIFICATION forming part of Letters Patent No. 728,442, dated May 19,1903.

Application filed May 22, 1902. Serial No. 108,556. No model.)

To all whom t may concern,.-

Be it known that I, EDWARD J. BURKE, a citizen of the United States,residing at Olyphant,in the county of Lackawanna and State ofPennsylvania, have invented certain new and useful Improvements inElectrical Insulators, of which the following is a specification.

This invention relates to insulators for elec- Io trical wires, andV hasfor its objects to provide an insulator in which no tying-Wire isrequired, to provide an attachment of wires to the insulator more securethan those heretofore in use, to provide a construction wherein theWeight of the wire assists in holding it taut in the fastenings, andother objects, as are herein set forth, and more particularly pointedout in the claims.

To these ends the invention consists of the 2o construction,combination, and arrangement of parts as specified, and illustrated inthe drawings, in Which- Figure 1 is a side elevation of an exterior viewof one of my insulators with a wire attached. Fig. 2 is a partial viewin cross-section, taken on the line :c y of Fig. 1. Fig. 3 is an upperend view of one of my insulators, taken at right angles to that shown inFig. l, the wire being removed. Fig. 4 is a top plan 3o View of one ofmy insulators with the wireholding wedges removed. Fig. 5 is a detailview in perspective of one of the fasteningwedges used in my device.

Similar characters of reference denote like and corresponding partsthroughout the several views.

In the drawings, l denotes the body or principal member of one ofmyinsulators. It may be constructed from glass, porcelain, or other 4onon-conducting material. The upper end of the body portion is bifurcatedor separated into two lips 2 2, each of which is recessed at 2 2 toaccommodate the similar wedges 3 3 in attaching the wire 4 to beinsulated. The

wedges 3 are provided with a ribbed or serrated groove 5, constructedfor the purpose of grasping the wire 4 .when placed in position. Theinsulator in general is also furnished with a neck G, to which awiremaybe attached in the usual way, if desired, and 5o will be found usefulwhere branch lines are to be connected with the main line. My device isalso provided with the usual petticoat 7 and with an interiorscrewthread 8, by means of which it is fastened to a peg 9, similar tothe insulators in common use. Two wedges are to be used like that shownin Fig. '5 in attaching a wire to one insulator, and the wedges may beconstructed from insnlating material or not, as preferred. It will 6ogenerally be preferred to make them from iron galvanized, so as toprevent corrosion. When galvanized with a coat corresponding to that ofthe wires to be insulated, they will resist the effects of atmosphereand water as long as the wire of the insulator itself, and when a newwire is to be inserted new wedges of course should be supplied. Thewedges should be cut sufficient-ly thin at their lower ends 10 so thatthe wire to be held by them 7o receives the entire lateral pressure whenthey are inserted in the top of the insulator.

The operation of the device is as follows: The wires to be insulated arestretched taut in the usual way, lying in the vicinity of the points towhich they are to be attached to the insulators. The Wire is thengrasped between two of the wedges, with their grooves 5 coincidin g asnear as may be, and the wire being held between the wedges in thatposition is 8o inserted with thewedges into the insulator, the wedgesresting in the recesses 2 2 and being pressed therein until the wire isgrasped tightly between them. The force of gravity acting on the wirestends to held them down in this position, and the fastening to theinsulator is complete.

I do not wish to be confined to the exact structure and description setforth, as it is evident that the form of the wedges and of 9o the bodyof the insulator, as well as the fastenings to poles or pegs, may begreatly varied without departing from the general spirit of myinvention.

What I claim, and desire to secure by Letters Patent, is-

l. An insulator constructed from a body portion of insulating materialhaving an upbody portion pettiooated, and having serewthreads forattachment to a peg, of a recessed groove in the upper end of said bodyportion, and Wireholding members insertible within the recess of saidbody portion and arranged to be held in position by gravity,substantiaily as and for the purpose specified.

In testimony whereof I afx my signature in presence of two witnesses.

EDWARD'J. BURKE.

Witnesses: l

F. J. DE LAOEY, D. G. MORAN.

